I recently did a tee shirt quilt and used Kona cottons for the sashings. ( a med. blue and a bright red) Really frayed a lot. I actually used a 3/8 in. seam to allow for trimming. But I love the feel of cutting and sewing with this fabric. I've used the black a couple of years ago and don't remember it fraying as much. And it seemed heavier. It, too, was Kona cotton.